Chery Tiggo 5 (T21). Manual - part 118

07–

58

07

4. Remove the valve spring upper seat (1), valve spring (2) 

and valve (3) from cylinder head.

5. Using a valve oil seal remover (1), remove the valve oil 

seal (2).

6. Using a flexional magnetic rod, remove the valve spring lower seat.

Inspection

1. Check cylinder head.

a. Check appearance.

 Check if there are scratches on the camshaft bearing journal.
 Remove carbon deposits and varnish inside valve guide with the valve guide cleaner.
 Make sure that valve cotter can move and rotate in cylinder bore freely.

b. Check cylinder head flatness.

Using a precision ruler and feeler gauge, check 
cylinder head flatness. Cylinder head flatness must be 
within 0.04 mm.

If cylinder head flatness is not within the specified 
range, repair or replace cylinder head.

RT21070560

1

2

3

1

RT21070570

2

RT21070580

Measurement Item

Specification 

(mm)

Cylinder Head Flatness

0.04

07–

59

07

c. Check cylinder head height.

Using a precision ruler, measure cylinder head height.

If cylinder head height is not within the specified 
range, replace cylinder head.

2. Check valve spring.

Using a vernier caliper, measure free length of valve 
spring and length of valve spring with the pre-pressure 
between 249 N and 271 N.

If valve spring length is not within the specified range, 
replace valve spring.

3. Check valve.

a. Clean valve.

 Using a scraper, remove the carbon deposited on 

valve head 

 Using a wire brush, clean the valve thoroughly.

b. Check valve height.

Using a micrometer, measure valve height.

If height is less than specified value, replace the 
valve.

a

RT21070581

Measurement Item

Specification 

(mm)

Cylinder Head Height

97

CAUTION

 During replacement, cylinder head should be fully equipped with valves, oil seals, springs, spring seats, 

cotters, hydraulic lifters and camshafts.

RT21070582

Measurement Item

Specification 

(mm)

Valve Spring Free Length

47.70

Valve Spring Length under 

Pre-pressure

41

RT21070583

RT21070584

Total Height

Measurement Item

Specification 

(mm)

Intake Valve Height

107.998

Exhaust Valve Height

106.318

07–

60

07

c. Check valve head.

 Measure valve head thickness "a" and record.
 Check if the contacting area of grommet is even 

and if grommet is located at the center of valve 
inclined plane, and measure grommet width "b".

If it is not within the specified range, replace valve.

d. Check valve stem diameter.

Using a micrometer, measure valve stem diameter.

If valve stem diameter is not within the specified 
range, check the clearance between valve stem and 
valve guide.

e. Check clearance between valve and valve guide.

Using a caliper gauge, measure the inside diameter of 
valve guide.

Clearance between valve and valve guide = Valve 
guide inner diameter - Valve stem diameter

If clearance is not within the specified range, replace 
valve or valve guide.

RT21070585

b

a

Measurement Item

Specification 

(mm)

Intake Valve Head Thickness

0.9

Exhaust Valve Head Thickness

0.7

Intake Valve Grommet Width

2.263

Exhaust Valve Grommet Width

2.828

RT21070586

Measurement Item

Specification 

(mm)

Intake Valve Stem Diameter

5.98 ± 0.008

Exhaust Valve Stem Diameter

5.96 ± 0.008

RT21070587

Measurement Item

Specification 

(mm)

  Valve Guide Inner Diameter

6 - 6.015

Measurement Item

Specification 

(mm)

Clearance Between Intake Valve and 

Guide

0.012 - 0.043

Clearance Between Exhaust Valve 

and Guide 

0.032 - 0.063

07–

61

07

4. Check valve stem protrusion amount.

a. Using a vernier caliper, measure distance "a" (valve 

stem protrusion amount) between valve stem end 
surface and valve spring seat end surface.

If valve stem protrusion is not within the specified 
range, replace valve.

Assembly

HINT:
Clean all components to be assembled thoroughly before assembly.

1. Install the valve (1) into the cylinder head.

HINT:

 Distinguish intake valves and exhaust valves during 

installation.

 Apply a light coat of engine oil to the valve stem end 

when assembling the valve.

2. Install the new valve spring lower seat (2) if necessary.

HINT:
Bottom of valve spring lower seat should face the 
cylinder head.

3. Install the valve oil seal.

HINT:
Apply a light coat of engine oil to the installation surface 
of valve oil seal end when assembling the valve oil seal.

a. Install the valve oil seal guide sleeve (3) to the valve 

stem.

b. Install the valve oil seal (4) to the valve oil seal guide 

sleeve.

c. Tap the valve oil seal installer lightly with a rubber 

hammer to install the valve oil seal in place.

a

RT21070588

Measurement Item

Specification 

(mm)

Intake Valve Stem Protrusion

31.497 - 31.515

Exhaust Valve Stem Protrusion

31.497 - 31.515

CAUTION

 Soak new valve oil seal in oil for several minutes before installation.
 Check if valve spring lower seat is installed properly before installing valve spring.
 Variable pitch valve spring is used, which must be installed with the painted side facing the valve spring 

lower seat.

5

4

3

2

1

RT21070589